Capacities 1/3 thru 55 metric tons, grade 6. Forged – Quenched and Tempered, with alloy pins. Working Load Limit and grade 6 permanently shown on every shackle. Hot Dip galvanized. Sizes 3/8 inch and below are mechanically galvanized. Fatigue rated. Shackles 25t and larger are RFID EQUIPPED. Approved for use at -40 C (-40 F) to 204 C (400 F). Meets or exceeds all requirements of ASME B30.26. Type Approval certification in accordance with ABS 2016 Steel Vessel Rules and ABS Guide for Certification of Lifting Appliances available. Look for the Red Pin. . . the mark of genuine Crosby quality.